Spark-gap-cooling device.



W. E. D. STORES, 311.65 GKW. DAVIS.' SPARK GAP COOLING DEVICE.APrLIATIoN FILM; 06T. 9,1908.

tts/ttt @www 7%' d: ddm 7i Patented sept. 16,1913.

' of the United f Unire 'earns .are raie WILLIAM 'n D. s'roxns'an., orNEW Yoan, N. Y., AND GEORGE w. DAVIS, or Gatinais,

NEW JERSEY, V.ASSXG-NORS TO WILLIAM E. D. STOKESQOF NEW YORK, .N. Y.

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i Specication of Letters Patent.

Application led 0ctober'9, 1908. .Serial Nb. 457,010.

To all whom; t may concern: Be t'know'n that we, WILLIAM E. D.

STORES, Jr., andGEonon W. DAvis, citizens States, res1d1ng atN ew York,

in the 'county .of New Yorlrand State of New York, and at Galilee, inthe county of Monmouth and StateofNew Jersey,respec' tively, haveinvented a new and useful linproveinent in Spark-Gap-Cooling Devices, ofwhich the following is 'asp'eciication In wirelesstelegraph or telephonesystems employing la spark gap, it-has heretofore been proposed to coolthe terminals, the

space between which forms the gap, by an air'blast or current directedat 'right angles or laterally to the gap. This hasl not proven eilicientin practice, because if a blast 1s used strong enough to effect theproper'cooling function, it is apt to blow out or extinguish the sparkor are and cut down the oscillation period. To overcome this difficulty4we have arranged'the cooling device, such 'as an airv blast nozzle, soas to direct the blast directly to .one or ,both terminals snbstantially parallel with the action! of the spark or arc. ln

this way the terminals can bekept cool and the'tende'ncy to blow outvthespark or arc can be eliminated.

The invention is shown in ing drawing in which, 4

ln Figure l a sending or transmitting' plant of a Wireless telegraphstation vis the accompany- 'shown in diagram withcnr improvementappliedv thereto; and Figs. 2 and 3` are a plan and side elevationrespectively of the cooler, which is arranged between the terminals inFig. l. l ,p Referring to the drawings and in detail, A designates theaerial of a wireless station, which is connected to the secondary S ofan induction coil l, Whichbis provided with the usual sphericalterminalsl T T, and in which one terminal is connected to the aerial A,and the other to 'th'e ground oreal-th E.

P designates the primary of the induction coil .which is incircuit witha source of current, as a generator D, and vwhich circuit is providedwith a` telegraph key K, an intcrrupter or breaker B, and a condenserC.

These parts are arranged to represent an' ordinary close-coupledtansinitting plant.

ln operation when the key is depressed a series'of electrical impulseswill be caused' tol How through the primary P `which will inn .I

oyercoi'ne this defect, we rice directly between lthe terminals T-J.This cooling device as shown consists of a'y perforations 10 in itssides.

duce high tension alternations in the secondary S, which will causesparks between the terminals TT, and will impress electricaloscillations on the aerial A. In use these terminals become heated andoxidized by reason of the sparkor arc so as to intertere with theaccurate operation thereof. To

place a cooling dethin, hollow, circular nozzle N which has This nozzlePatented sept. le, isis. i

may be made ont of any suitable non-oxidizing material, such asplatinum, porcelain, etc. The nozzle is provided with an insulatingjoint 1l, and is connected by a pipe l2 with a. blower or fan F, so thatin operation an .air blast will be "caused to vflow Vdirectly againstthe activeurfaces of the terminals and substantially parallel with thespark. This action will-not. tend to extinguish 'the spari: or are andwill keep the terminals cool and prevent the breaking downv of thesaine. The action of the air blast is constant, as the. air blast.nozzle is permanently arranged between the terminals,

By the arrangements describedithe action of the spark or arc is notmaterially interfered with, and the terminals are kept cool and will'last for a long time. The arrange ments described. niay'be lalso usedinthe spark gap ...f/' a receiving planter 'generally betnf'eenany twoterminals, the space between which forms a spark gap.

Other arrangements may be made for practising the invention withoutdeparting from the scope thereof as expressed in the claims. i Y

Having thus nlly described our invention, what 'we claim and desire tovsecure by Letters-Patent ist--` 1. The'combinaticn of separatedterminals forming a spark gap, and a cooling device arranged betweensaid terminals consisting of a fixed nozzle arranged to direct a blastparallel with the spark or arc.

2. The combination of separated termiico nals forming a spark gap, afixed air blast nozzle arranged between the terminals and havingopenings for directing a blast of air continuously on each terminalparallel with the spark or gap.

3. The' combination of separated terminals forming a spark gap, a,hollow7l perset our hands, in the presence of two subforated blastnozzle arranged permanently scribing Witnesses.

between the terminals and havmg perfora- WILLIAM E. D. STOKESQIR. tionsfor directing blasts onleach.- ternzlmail` GEORGE W. DAVIS. 5 parallelwith thespank or arc,` anda source Witnesses: I" of air pressureconnected thereto.. Y FREDERICK L. SEARING,

In testimony whereof We have hereunto A I-I. GLEASON.

Gopiesof thislpatent may be obtained for ve cents each, by addressingthe Commissionerof Ilatents. Washington, D. C.

